http://collections.mfa.org/internal/media/dispatcher/1298189/resize%3Aformat%3Dfull;jsessionid=00CD74E6B9CC07093AA41F83B13E9B52Planispheric astrolabedated 1375Petrus RaimundusGilded brassFoliated scroll attachment at top; the inner discs are engraved on both sides with circles and figures, the open-work piece above these is covered with engraved letters and figures.Tools and equipment16.2000000000 Centimeterhttp://collections.mfa.org/objects/detailsrdf/61726;jsessionid=00CD74E6B9CC07093AA41F83B13E9B52